I'm on my second Pirate screwlock right now (tore my first one up with an intense canyoneering summer last year) and I think it's the best belay 'biner I've ever owned. Love everything about it: size, shape, locking mechanism, price etc. I especially like the way the smooth radius interacts with the rope. The next one I buy will probably be an auto-lock, just to try it out.

I bought this as a belay/rappell biner and it works better than any other I've used. The screwlock overlaps the keylock portion of the biner by nearly 1/2" which makes it very easy to see it's locked at a glance. Also there is a skull & crossbones on the biner which is displayed if you don't have the screwlock tightened all the way. Neat little addition to a very solid biner.

Certainly one of the most featured belay carabiners on the market. The slightly offset gate creates a larger opening for easy rope handling. The thimble is nicely shaped, reducing rope catching. No sharp edges anywhere, and it's a keylock. The autolock version might even be better, with the best gate sleeve I've seen (no snag, super strong)on any carabiner of this type.